CN102595750B - Discharge lamp driving device, projector, and method for driving a discharge lamp - Google Patents

Discharge lamp driving device, projector, and method for driving a discharge lamp Download PDF

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Publication number
CN102595750B
CN102595750B CN201210007471.6A CN201210007471A CN102595750B CN 102595750 B CN102595750 B CN 102595750B CN 201210007471 A CN201210007471 A CN 201210007471A CN 102595750 B CN102595750 B CN 102595750B
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CN
China
Prior art keywords
discharge lamp
aforementioned
current
lamp
modulation rate
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Expired - Fee Related
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CN201210007471.6A
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Chinese (zh)
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CN102595750A (en
Inventor
木村佳司
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Seiko Epson Corp
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Seiko Epson Corp
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    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details
    • G03B21/20—Lamp housings
    • G03B21/2053—Intensity control of illuminating light
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B30/00—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images
    • G02B30/20—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images by providing first and second parallax images to an observer's left and right eyes
    • G02B30/22—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images by providing first and second parallax images to an observer's left and right eyes of the stereoscopic type
    • G02B30/24—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images by providing first and second parallax images to an observer's left and right eyes of the stereoscopic type involving temporal multiplexing, e.g. using sequentially activated left and right shutters
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B35/00—Stereoscopic photography
    • G03B35/16—Stereoscopic photography by sequential viewing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N13/00—Stereoscopic video systems; Multi-view video systems; Details thereof
    • H04N13/30—Image reproducers
    • H04N13/332—Displays for viewing with the aid of special glasses or head-mounted displays [HMD]
    • H04N13/341—Displays for viewing with the aid of special glasses or head-mounted displays [HMD] using temporal multiplexing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N13/00—Stereoscopic video systems; Multi-view video systems; Details thereof
    • H04N13/30—Image reproducers
    • H04N13/363—Image reproducers using image projection screens
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N13/00—Stereoscopic video systems; Multi-view video systems; Details thereof
    • H04N13/30—Image reproducers
    • H04N13/398—Synchronisation thereof; Control thereof
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
    • H04N9/3141—Constructional details thereof
    • H04N9/315—Modulator illumination systems
    • H04N9/3155—Modulator illumination systems for controlling the light source
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
    • H05B41/14—Circuit arrangements
    • H05B41/16—Circuit arrangements in which the lamp is fed by dc or by low-frequency ac, e.g. by 50 cycles/sec ac, or with network frequencies
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
    • H05B41/14—Circuit arrangements
    • H05B41/24—Circuit arrangements in which the lamp is fed by high frequency ac, or with separate oscillator frequency
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
    • H05B41/14—Circuit arrangements
    • H05B41/26—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc
    • H05B41/28—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters
    • H05B41/288—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters with semiconductor devices and specially adapted for lamps without preheating electrodes, e.g. for high-intensity discharge lamps, high-pressure mercury or sodium lamps or low-pressure sodium lamps
    • H05B41/2885—Static converters especially adapted therefor; Control thereof
    • H05B41/2887—Static converters especially adapted therefor; Control thereof characterised by a controllable bridge in the final stage
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Projection Apparatus (AREA)
  • Circuit Arrangements For Discharge Lamps (AREA)

Abstract

The invention is to provide a discharge lamp driving device, a projector, and a method for driving a discharge lamp, the device, the projector, and the method that can drive a discharge lamp by an appropriate lamp current when driving the discharge lamp by performing amplitude modulation on a lamp current. The discharge lamp driving device (10) includes: a direct-current power supply section (2) (a power supply section) that controls a current of power to be supplied to the discharge lamp (20) from input power, and outputs the current; a voltage detecting section (5) that detects a lamp voltage (a drive voltage) of the discharge lamp (20); and a control section (7) that controls a modulation factor of a lamp current (a drive current) on which amplitude modulation has been performed, the lamp current (the drive current) which is supplied to the discharge lamp (20) from the direct-current power supply section (2) (the power supply section), in accordance with the detected lamp voltage (drive voltage) of the discharge lamp (20).

Description

Discharge lamp driven apparatus, projector and discharge lamp driving method
Technical field
The present invention relates to discharge lamp driven apparatus, projector and discharge lamp driving method.
Background technology
Existing, by image projection in the projector of screen, there is following technology: the drive current of the discharge lamp by the light source to for projector (following, also referred to as lamp current) carries out Modulation and Amplitude Modulation and drives, and colour balance or lightness are controlled.For example, there is following projector: the colour disk that the white light utilization from the outgoing of light source institute is comprised to R (red), G (green), B (indigo plant) look colour filter carries out timesharing, and be the picture signal projection of color separately by the light modulation of this timesharing.In projector so, following methods is proposed: by the lamp current of discharge lamp is driven in the time by predetermined colour filter at light with increasing, colour balance is controlled to (for example, patent documentation 1).
And, 3 dimensions (following, also referred to as 3D) image is carried out in the projector of projection, exist and use the image of using with left eye to carry out the alternately 3D projector of the time-sharing format of projection of timesharing to right eye.The 3D projector of this time-sharing format has and is synchronized with the left eye that carries out projection and with image, alternately changes respectively the shutter glasses that left eye is used the switching of the liquid crystal shutter of using with right eye with image and right eye.And user, owing to watching the image of institute's projection by shutter glasses, can see 3D rendering.In this situation, because the image timesharing in 1 frame is image and right eye 2 kinds of images of image for left eye, the left eye of institute's projection becomes half with image and right eye with image lightness separately, and the lightness that arrives left eye and right eye image is separately dimmed.And, when left eye is changed with image with image and right eye, due to exist in during this conversion carry out by left eye use control that the liquid crystal shutter used with right eye closes simultaneously during, the lightness of image that arrives eyes is further dimmed.For this is improved, exist and make lamp current carry out in the following manner amplitude-modulated method: the arbitrary liquid crystal shutter that left eye is used use with right eye open during lamp current increase, the lamp current during making that liquid crystal shutter closes simultaneously reduces.According to the method, the average power that can not make the driving power (following, also referred to as lamp power) of discharge lamp increases and the lightness that makes to arrive the image of eyes brightens.
Patent documentation 1 JP 2007-121971 communique
; because there is incipient surge and last variation at the driving voltage of discharge lamp (following, also referred to as modulating voltage), so even in the situation that be supplied in the average power of discharge lamp and become regularly and drive; if modulating voltage declines to some extent, lamp current also increases to some extent.Thereby discharge lamp driven apparatus is carrying out in amplitude-modulated situation the lamp current of discharge lamp, even if the average current of lamp current is below rated current, during making that lamp current increases in, also can exist lamp current to surpass the situation of rated current.In this situation, in discharge lamp driven apparatus, heating becomes problem, exists the cost up of the parts that are used in discharge lamp driven apparatus or the size of parts to become large problem corresponding to this.
Summary of the invention
The present invention has done in view of situation so, its object is to provide the in the situation that of discharge lamp driving lamp current is carried out to Modulation and Amplitude Modulation, discharge lamp driven apparatus, projector and the discharge lamp driving method that can to discharge lamp, drive by suitable lamp current.
The present invention is used for addressing the above problem and has done, discharge lamp driven apparatus of the present invention is characterised in that: possess power supply unit, voltage detection department and control part, wherein, described power supply unit is according to inputted power, to controlling and export for being supplied in the electric current of the power of discharge lamp; Described voltage detection department detects the driving voltage of aforementioned discharge lamp; Described control part is corresponding to the driving voltage of the aforementioned discharge lamp detecting, and to be supplied in the modulation rate of the modulated drive current of the amplitude of aforementioned discharge lamp from aforementioned power supply unit, controls.
According to the present invention, control part, corresponding to the driving voltage of discharge lamp, is controlled be supplied in the modulation rate of the drive current of discharge lamp from power supply unit.Thereby, the in the situation that discharge lamp driven apparatus of the present invention driving discharge lamp drive current is carried out to Modulation and Amplitude Modulation, can, corresponding to the driving voltage of discharge lamp, by the modulation rate by suitable, carry out amplitude-modulated drive current discharge lamp has been driven.
And, in discharge lamp driven apparatus of the present invention, be characterised in that: aforementioned control part, corresponding to the decline of the driving voltage of aforementioned discharge lamp, is controlled the modulation rate that is supplied in the drive current of aforementioned discharge lamp for low modulation rate.
According to the present invention, in the situation that the driving voltage of discharge lamp declines, control part is corresponding to the driving voltage of this decline, will carry out amplitude-modulated modulation rate and controls as low modulation rate being supplied in the drive current of discharge lamp.Thereby, the in the situation that discharge lamp driven apparatus of the present invention driving discharge lamp drive current is carried out to Modulation and Amplitude Modulation, can, corresponding to the decline of the driving voltage of discharge lamp, with the modulation rate by low, carry out amplitude-modulated suitable drive current discharge lamp has been driven.
And, in discharge lamp driven apparatus of the present invention, be characterised in that: aforementioned control part, in the situation that the driving voltage of aforementioned discharge lamp is more than predetermined threshold value, is controlled the modulation rate that is supplied in the drive current of aforementioned discharge lamp for predetermined modulation rate; And in the situation that the driving voltage of aforementioned discharge lamp is lower than aforementioned predetermined threshold value, corresponding to the decline of the driving voltage of aforementioned discharge lamp, the modulation rate that is supplied in the drive current of aforementioned discharge lamp is controlled as than the low modulation rate of aforementioned predetermined modulation rate.
According to the present invention, the drive current of discharge lamp is carried out to Modulation and Amplitude Modulation by predetermined modulation rate, and in the situation that the driving voltage decline of discharge lamp, control part, corresponding to the driving voltage of this decline, is controlled the modulation rate that is supplied in the drive current of discharge lamp for the modulation rate lower than predetermined modulation rate.Thereby, the in the situation that discharge lamp driven apparatus of the present invention driving discharge lamp drive current is carried out to Modulation and Amplitude Modulation, can, corresponding to the decline of the driving voltage of discharge lamp, with the modulation rate by low, carry out amplitude-modulated suitable drive current discharge lamp has been driven.
And discharge lamp driven apparatus of the present invention possesses the current detecting part that the drive current of aforementioned discharge lamp is detected; Aforementioned control part in the situation that control being supplied in the modulation rate of the drive current of aforementioned discharge lamp, is controlled: the average power of the driving voltage of the aforementioned discharge lamp based on detecting and the driving power of the aforementioned discharge lamp that drive current calculates is become necessarily in the following manner.
According to the present invention, control part in the situation that control being supplied in the modulation rate of the drive current of discharge lamp, is controlled: the average power of driving power is become necessarily in the following manner.Thereby, the in the situation that discharge lamp driven apparatus of the present invention driving discharge lamp drive current is carried out to Modulation and Amplitude Modulation, can not make the average power of driving power increase and discharge lamp is driven.
And, in discharge lamp driven apparatus of the present invention, be characterised in that: the modulating frequency that is supplied in the drive current of aforementioned discharge lamp is the frequency that is synchronized with inputted picture synchronization signal frequency.
According to the present invention, control part carries out Modulation and Amplitude Modulation to being supplied in the drive current of discharge lamp by being synchronized with the frequency of picture synchronization signal frequency.Thereby, the in the situation that discharge lamp driven apparatus of the present invention driving discharge lamp drive current is carried out to Modulation and Amplitude Modulation, can be synchronized with the frequency of picture synchronization signal and the lightness of discharge lamp is controlled.
And, in discharge lamp driven apparatus of the present invention, be characterised in that: aforementioned predetermined threshold value is the voltage below the first interim driving voltage of the aforementioned discharge lamp of manufacture.
According to the present invention, at the first interim driving voltage with respect to manufacturing discharge lamp, in the situation that the driving voltage of this discharge lamp declines, corresponding to the decline of this driving voltage, the modulation rate of drive current is controlled.Thereby, the in the situation that discharge lamp driven apparatus of the present invention driving discharge lamp drive current is carried out to Modulation and Amplitude Modulation, in the situation that wait driving voltage than the driving voltage decline at the initial stage of manufacturing discharge lamp owing to lasting variation, can discharge lamp be driven with suitable drive current.
And projector of the present invention is characterised in that: possess above-mentioned discharge lamp driven apparatus.
According to the present invention, can provide the in the situation that of discharge lamp driving drive current is carried out to Modulation and Amplitude Modulation, corresponding to the driving voltage of discharge lamp, by the modulation rate by suitable, carried out the projector that amplitude-modulated drive current drives discharge lamp.
And, projector of the present invention is characterised in that: possess above-mentioned discharge lamp driven apparatus and image control portion, described image control portion passes through time-sharing format, carry out that the image of institute's projection is alternately converted to left eye and with image and right eye, use the control of image, and output is synchronized with aforementioned left eye image and the aforementioned right eye picture synchronization signal of the conversion timing of image; Aforementioned discharge lamp driven apparatus, based on aforementioned picture synchronization signal, carries out Modulation and Amplitude Modulation to be synchronized with earlier figures as the frequency of synchronous signal frequency to being supplied in the drive current of aforementioned discharge lamp.
According to the present invention, projector is synchronized with the left eye of institute's projection and with image and right eye, uses the conversion timing of image, to being supplied in the drive current of discharge lamp, carries out Modulation and Amplitude Modulation.Thereby projector of the present invention can not make average power increase and make the image that arrives eyes become bright, and in the situation that the driving voltage of discharge lamp declines, also can discharge lamp be driven with suitable drive current.
And discharge lamp driving method of the present invention is characterised in that and comprises the following steps: power supply unit is according to inputted power, to controlling and export for being supplied in the electric current of the power of discharge lamp; Voltage detection department detects the driving voltage of aforementioned discharge lamp; With the driving voltage of control part corresponding to the aforementioned discharge lamp detecting, to be supplied in the modulation rate of the modulated drive current of the amplitude of aforementioned discharge lamp from aforementioned power supply unit, control.
According to the present invention, in control part, corresponding to the driving voltage of discharge lamp, carry out the step of controlling be supplied in the modulation rate of the drive current of discharge lamp from power supply unit.Thereby, according to discharge lamp driving method of the present invention, the in the situation that of discharge lamp driving lamp current is carried out to Modulation and Amplitude Modulation, can, corresponding to the driving voltage of discharge lamp, by the modulation rate by suitable, carry out amplitude-modulated drive current discharge lamp has been driven.
Accompanying drawing explanation
Fig. 1 means the general block diagram of the formation of the projector that embodiment of the present invention relates to.
Fig. 2 means the sequential chart of the relation of lamp power and image and shutter glasses.
Fig. 3 means the oscillogram of discharge lamp being carried out to the relation of modulating voltage in driving situation and lamp current.
Fig. 4 means the oscillogram of the control of modulation rate when lamp current is carried out to Modulation and Amplitude Modulation.
Fig. 5 means the general block diagram of one of formation of the discharge lamp driven apparatus that execution mode relates to example.
Fig. 6 means the oscillogram of lamp current having been carried out to the output state of the each several part in Modulation and Amplitude Modulation situation.
Fig. 7 means the flow chart of control of the Modulation and Amplitude Modulation rate of lamp current.
The explanation of symbol
2... DC power supply portion (power supply unit), 3... change of current portion, 4... point highlights, 5... voltage detection department, 6... current detecting part, 7... control part, 10... discharge lamp driven apparatus, 20... discharge lamp, 50... image control portion, 100... projector
Embodiment
Below, with reference to accompanying drawing, about embodiments of the present invention, describe.Also have, at each following accompanying drawing, be used for making each inscape apparent, the engineer's scale that sometimes makes size illustrates because of inscape strange land.
Fig. 1 means the general block diagram of one of formation of the projector 100 that one embodiment of the present invention relates to example.Projector 100 shown in Fig. 1 at every 1 frame, carry out timesharing alternately change left eye with the projection of image and right eye use image in screen 127, and user is owing to watching the image of this projection can obtain the 3D projector of the time-sharing format of relief 3 dimensions (following, to be called 3D) image by shutter glasses 80.Projector 100 possesses lighting device 110, color separation optical system 121, liquid crystal light valve 122～124, cross colour splitting prism 125, projection optical system 126, image control portion 50, shutter glasses control part 60, sending part 70 and shutter glasses 80.
Lighting device 110 possesses light supply apparatus 30, the 1st lens arra 111 and the 2nd lens arra 112.And the 1st lens arra 111 and the 2nd lens arra 112 possess respectively a plurality of lens 111a and lens 112a.And, from the emitted light of light supply apparatus 30 due to through the 1st lens arra 111 and the 2nd lens arra 112, in the liquid crystal light valve 122～124 as illuminated region, Illumination Distribution homogenizing.
Color separation optical system 121 possesses dichronic mirror 113,114, speculum 115～117 and lens 118～120, and the light from 110 incidents of lighting device is separated into red light LR, green light LG and blue light LB, is incident in respectively liquid crystal light valve 122～124.Dichronic mirror 113,114 for to the light selecting performance in presetted wavelength region reflect the light transmissive mirror body that makes the wavelength region may beyond it, for example, for there is the mirror body of dielectric multilayer film at transparency carrier superimposed layer.Dichronic mirror 113 makes from red light LR transmission among the light of lighting device 110, green light LG and blue light LB is reflected.Dichronic mirror 114, among reflected green light LG and blue light LB, makes blue light LB transmission, and to green light, LG reflects.
Thus, among the light from lighting device 110, red light LR in transmission after dichronic mirror 113, with speculum 117 reflections, be incident in the liquid crystal light valve 122 that red light is used.Green light LG, after with dichronic mirror 113 reflections, with dichronic mirror 114 reflections, is incident in the liquid crystal light valve 123 that green light is used.Blue light LB is with dichronic mirror 113 reflection, in transmission after dichronic mirror 114, scioptics 118, speculum 115, lens 119, speculum 116 and lens 120, be incident in the liquid crystal light valve 124 that blue light is used.
The picture signal of liquid crystal light valve 122～124 based on inputting from outside, the red light LR of institute's incident, green light LG and blue light LB are modulated and generate the image light of red image light, green and the image light of blueness, and be incident in respectively cross colour splitting prism 125.
The red image light of 125 pairs of institutes of cross colour splitting prism incident, green image light and blue image light synthesize and generate coloured image light.The structure that cross colour splitting prism 125 fits for right-angle prism, within it the face crosswise landform minute surface that the image light of redness reflects in pairs and the minute surface that blue image light is reflected.Thus, the image light of the red image light of institute's incident, green and blue image light are synthetic by this minute surface, generate coloured image light.
Projector 100, by generated coloured image light is situated between and amplifies projection in screen 127 by projection optical system 126, carries out projection to the image of the picture signal based on inputted.
The picture signal of image control portion 50 based on inputted, by time-sharing format, carries out that the image of institute's projection is alternately converted to left eye and with image and right eye, uses the control of image.For example, image control portion 50 is 2 1/2 image durations by timesharing 1 image duration, in every 1/2 image duration, left eye is changed with image with image and right eye, with image and right eye, used the image signal output of image in liquid crystal light valve 122～124 left eye based on this conversion.What 122～124 pairs of liquid crystal light valves were inputted modulates and synthetic image light by the picture signal of image with image and right eye based on left eye.Then, projection is amplified in screen 127 by generated image light is situated between by cross colour splitting prism 125 and projection optical system 126 by projector 100, and left eye is carried out to projection with image and right eye with image.
And image control portion 50 uses the picture synchronization signal of the conversion timing of image by being synchronized with left eye with image and right eye, be output in light supply apparatus 30 and shutter glasses control part 60.The picture synchronization signal of shutter glasses control part 60 based on inputted, the control signal that the left eye that generation has shutter glasses 80 is controlled with the switching of shutter 81R with shutter 81L and right eye.For example, shutter glasses control part 60 is in the situation that control as opening the state of shutter 81L for left eye, make left eye become H (height) level with shutter control signal, in the situation that control as closing the state of shutter 81L for left eye, make left eye become L (low) level with shutter control signal.And, shutter glasses control part 60 is in the situation that control as opening the state of shutter 81R for right eye, make right eye become H (height) level with shutter control signal, in the situation that control as closing the state of shutter 81R for right eye, make right eye become L (low) level with shutter control signal.And, shutter glasses control part 60 by left eye with shutter control signal and right eye with shutter control signal by sending part 70 wireless transmissions or wired shutter glasses 80 that is sent in.
Shutter glasses 80 is shutter control signal and right eye shutter control signal for the left eye based on sending by sending part 70 from shutter glasses control part 60, and left eye is driven with the switching of shutter 81R with shutter 81L and right eye.For example, at shutter 81L and right eye shutter 81R for left eye, as shutter, can adopt liquid crystal shutter.And, by control, put on the driving voltage of this liquid crystal shutter, convertiblely make light transmissive transmissive state and do not make light transmissive non-transmissive state.
So, the picture signal of projector 100 based on inputted, left eye is alternately changed with image with image and right eye and projection in screen 127.And user is watched the image of institute's projection by shutter glasses 80 owing to being situated between, from left eye, only see that left eye only sees right eye image with image and from right eye.Thus, in projector 100, for user, can obtain relief 3D rendering.
And light supply apparatus 30 possesses discharge lamp 20 and discharge lamp 20 is driven and to lighting the discharge lamp driven apparatus 10 of controlling.Discharge lamp 20 is such as being high-pressure mercury-vapor lamp, Halogen lamp LED and metal halide lamp etc.
In addition,, for user, expectation projection is brighter in the image of screen 127.In the lightness of the image of screen 127, brighter when the light quantity from 20 outgoing of discharge lamp is larger by projector's 100 projections.But, because the projector 100 for above-mentioned obtains 3D rendering, by the image timesharing of 1 frame, be image and these 2 of images of right eye for left eye, arrive the image light quantity minimizing separately for image and right eye for left eye of eyes, the light quantity that arrives respectively the image of left eye and right eye reduces.And due to the light transmission of liquid crystal shutter in shutter glasses 80 also not 100% etc., the light quantity that arrives eyes further reduces.Thereby, in projector 100, can obtain 3D rendering, on the other hand, in the situation that with the same control of the control of the light source of the common image of projection (image of only using for eyes is not used the common 2D image of shutter glasses) in, the lightness of image that arrives eyes is dimmed.
And, in the situation that 3D rendering is carried out to projection, projector 100 for left eye with the conversion of image and right eye use image the demonstration of image unsettled during (for example, left eye with image and right eye, with image, mix mutually during) in, control left eye for closing shutter glasses 80 with shutter 81L and right eye the state with shutter 81R both sides shutter.Although this control make image arrive eyes during shorter and become one of dimmed reason of the lightness of the image that arrives eyes, on the other hand, passing through this control the state of both sides' shutter close during in, needn't increase the light quantity of discharge lamp 20.Therefore, discharge lamp driven apparatus 10 drives in the following manner: make this both sides' shutter close during the light quantity of discharge lamp 20 reduce, the light quantity that makes to open left eye discharge lamp 20 during with shutter 81R with shutter 81L or right eye increases.
For example, the picture synchronization signal of discharge lamp driven apparatus 10 based on inputting from image control portion 50, is synchronized with the frequency of this picture synchronization signal, to being supplied in the lamp current of discharge lamp 20, by predetermined modulation rate, carries out Modulation and Amplitude Modulation.Particularly, discharge lamp driven apparatus 10 reduces lamp current in during both sides' shutter close of shutter glasses 80, and at left eye or right eye, with one of shutter, open during in lamp current is increased.Thus, in the situation that 3D rendering is carried out to projection, the average lamp current that projector 100 can not make to flow to discharge lamp 20 increases ground, and the lightness that makes to arrive the image of eyes brightens.
Next, utilize Fig. 2, about projector 100, in the situation that 3D rendering is carried out to projection, lamp current is carried out to Modulation and Amplitude Modulation and control that discharge lamp 20 is driven describes.
Fig. 2 for the frequency that represents to be synchronized with picture synchronization signal to lamp current carried out lamp power in Modulation and Amplitude Modulation situation, image, with the sequential chart of the relation of shutter glasses 80.At this, the situation that the picture synchronization signal of take is following signal is example: this signal make image 1 image duration 1/2 during become 1 cycle, in the timing of the rising edge of this synchronizing signal, start left eye conversion with right eye use image with image, and in the timing of trailing edge the EOC of image.And the transverse axis of Fig. 2 is the time, the state of Fig. 2 (a) presentation video signal, Fig. 2 (b) represents the signal level of shutter control signal, Fig. 2 (c) represents the open and-shut mode of shutter, Fig. 2 (d) indication lamp power.
Also have, in the figure, lamp current and lamp power are usingd to the modulated situation of modulation rate 50% amplitude and as one, exemplify.
During t0～moment in moment t4 of Fig. 2, be equivalent to image 1 frame during.And, constantly t0～moment t2 during and constantly t2～moment t4 during be by timesharing during 1 frame be 2 1/2 frames during separately during.
During t0～moment in moment t1, projector 100 is converted to left eye image from right eye with image by the image of institute's projection.In this period, shutter glasses control part 60 makes left eye with shutter control signal, become L (low) level with shutter control signal and right eye, controls as closing the left eye of shutter glasses 80 and with shutter 81L and right eye, uses the state of shutter 81R both sides shutter.And discharge lamp driven apparatus 10 is so that the lamp power of discharge lamp 20 reduces by 50% power from rated power Pm drives.
Next, during t1～moment in moment t2 in, projector 100 carries out projection to left eye with image as the image that carries out projection.In this period, shutter glasses control part 60 makes left eye become H (height) level with shutter control signal, on the other hand, makes right eye become L (low) level with shutter control signal.That is, shutter glasses control part 60 is controlled as opening the state of shutter 81L for the left eye of shutter glasses 80, on the other hand, controls as closing the state of shutter 81R for right eye.And discharge lamp driven apparatus 10 is so that the lamp power of discharge lamp 20 increases by 50% power from rated power Pm drives.
And during t2～moment in moment t3, projector 100 is converted to right eye image from left eye with image by the image that carries out projection.In this period, shutter glasses control part 60 makes left eye with shutter control signal, become L (low) level with shutter control signal and right eye, controls as closing the left eye of shutter glasses 80 and with shutter 81L and right eye, uses the state of shutter 81R both sides shutter.And discharge lamp driven apparatus 10 is so that the lamp power of discharge lamp 20 reduces by 50% power from rated power Pm drives.
And during t3～moment in moment t4, projector 100 carries out projection to right eye with image as the image that carries out projection.In this period, shutter glasses control part 60 makes left eye shutter control signal for becoming L (low) level, on the other hand, makes right eye become H (height) level with shutter control signal.That is, shutter glasses control part 60 is controlled as closing the state of shutter 81L for the left eye of shutter glasses 80, on the other hand, controls as opening the state of shutter 81R for right eye.And discharge lamp driven apparatus 10 is so that the lamp power of discharge lamp 20 increases by 50% power from rated power Pm drives.
So, projector 100 left eye is carried out with image with image or right eye projection during in, by increase by 50% lamp power from rated power Pm, discharge lamp 20 is driven, and left eye with image or right eye with in the transition period of image by discharge lamp 20 being driven from the lamp power of rated power Pm minimizing 50%.Thereby, if make lamp increased power during with reduce during for during equal length, as average lamp power, can not surpass rated power Pm, the lightness that can make to carry out the image of projection becomes bright.
Also have, because discharge lamp 20 is for determining voltage load, so in the situation that to driving increase or the minimizing of the lamp power of discharge lamp 20 to control, discharge lamp driven apparatus 10 is by making the lamp current of discharge lamp 20 increase or reduce and control.For example, in the situation that utilize the lamp increased power 50% that Fig. 2 is illustrated or reduce by 50% conversion and control, discharge lamp driven apparatus 10 carries out with modulation rate 50%, carrying out amplitude-modulated control to being supplied in the lamp current of discharge lamp 20.
Fig. 3 means the oscillogram of the relation of modulating voltage in the situation that discharge lamp 20 is driven and lamp current.And the lamp current of this figure represents lamp current not to be carried out to the lamp current in Modulation and Amplitude Modulation situation.Make the representative initial stage voltage of the modulating voltage of discharge lamp 20 (as the center of manufacturing fluctuation (inequality), initial stage after manufacturing voltage constantly) be in the situation of voltage V1, owing to manufacturing fluctuation or lasting variation etc., exist modulating voltage to become than the situation of the high voltage of voltage V1 or low voltage.In this situation, discharge lamp driven apparatus 10 is controlled in the following manner: even if make the modulating voltage change lamp power of discharge lamp 20 also can not surpass rated power Pm, carry out determining power drive.And, discharge lamp driven apparatus 10 in the situation that decline until lamp current becomes the voltage V2 of rated current Im as the situation and the modulating voltage that carry out determining power drive with respect to the change of modulating voltage, is controlled: make lamp current can not surpass rated current Im in the following manner.That is, discharge lamp driven apparatus 10 is voltage V2 following in the situation that at modulating voltage, carries out the lamp current that is supplied in discharge lamp 20 to be restricted to the control of rated current Im.
But, to being supplied in the lamp current of discharge lamp 20, carrying out in amplitude-modulated situation, owing to carrying out the current limit of the lamp current of determining power drive control and carrying out according to rated current Im of lamp power, it is specified can not to surpass with lamp current not being carried out to lamp current in Modulation and Amplitude Modulation situation is equal to for average lamp current, but exist the modulated peak swing of amplitude during in the over proof situation of lamp current.Because in discharge lamp driven apparatus 10 heating be substantially proportional to lamp current square and increase, so in the over proof situation of lamp current, for the heating corresponding to increasing, produce the cost up of the parts that use, or the problem that increases of the size of parts.That is, to being supplied in the lamp current of discharge lamp 20, carrying out in amplitude-modulated situation, with respect to not to lamp current carry out can not becoming in amplitude-modulated situation problem modulating voltage reduction and produce the problem with respect to heating.
Be used for addressing this problem, the discharge lamp driven apparatus 10 of present embodiment, carrying out in amplitude-modulated situation being supplied in the lamp current of discharge lamp 20, corresponding to the modulating voltage of discharge lamp 20, is controlled being supplied in the modulation rate of the lamp current of discharge lamp 20.
Fig. 4 means the oscillogram of the control of modulation rate when lamp current is carried out to Modulation and Amplitude Modulation, and transverse axis is modulating voltage, and the longitudinal axis is modulation rate.Utilize this figure, the modulating voltage about discharge lamp driven apparatus 10 corresponding to discharge lamp 20, describes being supplied in the control that the modulation rate of the lamp current of discharge lamp 20 controls.
Discharge lamp driven apparatus 10, in the situation that the modulating voltage of discharge lamp 20 is more than predetermined threshold value, is controlled the modulation rate that is supplied in the lamp current of discharge lamp 20 for predetermined modulation rate.For example, in the situation that make voltage V1 the modulation rate of being scheduled to of take that the predetermined threshold value of the modulating voltage of discharge lamp 20 is the initial stage voltage as this modulating voltage, it is modulation rate 50%, discharge lamp driven apparatus 10, in the situation that the modulating voltage of discharge lamp 20 is more than voltage V1, carries out Modulation and Amplitude Modulation to lamp current with modulation rate 50%.At this, the initial stage voltage of so-called modulating voltage is for manufacturing the modulating voltage at the initial stage of discharge lamp 20.For example, as the voltage V1 of the predetermined threshold value of the modulating voltage of discharge lamp 20 for manufacturing the modulating voltage at the initial stage of discharge lamp 20, the predetermined voltages such as the central value of the manufacture fluctuation producing for the every parts based at discharge lamp 20 or lower limit.
And discharge lamp driven apparatus 10, in the situation that the modulating voltage of discharge lamp 20 is lower than predetermined threshold value, corresponding to the modulating voltage of discharge lamp 20, is controlled the modulation rate that is supplied in the drive current of discharge lamp 20 for the modulation rate lower than predetermined modulation rate.For example, discharge lamp driven apparatus 10 is in the situation that the modulating voltage of discharge lamp 20 is lower than voltage V1, corresponding to the decline of the modulating voltage of discharge lamp 20, the modulation rate that is supplied in the lamp current of discharge lamp 20 controlled as the modulation rate lower than modulation rate 50%.At this, the so-called modulation rate lower than modulation rate 50% is the predetermined modulation rate of decline corresponding to modulating voltage, is modulation rate arbitrary modulation rate more than 0% and among being less than 50%.
And discharge lamp driven apparatus 10, for example in the situation that the modulating voltage of discharge lamp 20 is below voltage V2, carries out the control of modulation rate 0% and does not carry out amplitude-modulated control.Also have, discharge lamp driven apparatus 10 is at modulating voltage than the further step-down of voltage V2 in the situation that, as utilizes Fig. 3 to be illustrated, and carries out lamp current to be restricted to the control of rated current Im.
As with Shangdi, projector 100 carries out Modulation and Amplitude Modulation and is supplied in discharge lamp 20 lamp current to be synchronized with the frequency of picture synchronization signal frequency.For example, projector 100 make user by shutter glasses, watch institute's projection image during, be the state opened of the shutter of shutter glasses during in lamp current increase, and in making during other, lamp current reduces.Thus, projector 100 can not make the average power of lamp power increase ground, and the lightness that makes to arrive the image of eyes brightens.And, in the situation that the modulating voltage of discharge lamp 20 reduces than initial stage voltage V1, by reducing the modulation rate of lamp current, carry out Modulation and Amplitude Modulation, can suppress state that the shutter of shutter glasses opens during in the increase of peak swing of lamp current.Thus, can suppress the heating of each several part in projector 100, because needn't use the parts of reply heating, so can increase or part dimension becomes and suppresses greatly component costs.Thereby, the in the situation that projector 100 driving discharge lamp 20 lamp current is carried out to Modulation and Amplitude Modulation, can to discharge lamp 20, drive by suitable lamp current.
Next, about the formation of discharge lamp driven apparatus 10 and the control of the Modulation and Amplitude Modulation of lamp current, describe particularly.
Fig. 5 means the general block diagram of one of formation of the discharge lamp driven apparatus 10 that one embodiment of the present invention relates to example.Discharge lamp driven apparatus 10 possesses input power 1, DC power supply portion 2 (power supply unit), change of current portion 3, some highlights 4, voltage detection department 5, current detecting part 6 and control part 7, and discharge lamp 20 is driven.
Input power 1 is for supplying with the power supply of direct current power, for example, and also can be arbitrary for family expenses electrical network AC power being carried out to rectification and being smoothly transformed to power supply, continuous-current plant or the battery etc. of DC power supply.DC power supply portion 2 is for example down converter, according to the direct current power of inputting from input power 1, to controlling and be output in change of current portion 3 for being supplied in the electric current of the power of discharge lamp 20.And DC power supply portion 2 is adjusted into the modulating voltage for discharge lamp 20 is driven by the voltage of the direct current power of inputting from input power 1.
And, at the output of DC power supply portion 2, connect in parallel voltage detection department 5.The modulating voltage of 5 pairs of discharge lamps 20 of voltage detection department detects.For example, the output voltage of 5 pairs of DC power supply portions 2 of voltage detection department detects as modulating voltage, and the result detecting is output in to control part 7.And the power line at the negative electricity source of the output of DC power supply portion 2, is connected in series current detecting part 6.6 pairs of electric currents that flow through this power line of current detecting part detect as lamp current, and the result detecting is output in to control part 7.
Change of current portion 3 for example possesses 4 switch elements that full-bridge connects, by among 4 switch elements 2 respectively the conducting of 2 groups of paired switch elements alternately change with cut-off, the direct current of inputting from DC power supply portion 2 is transformed to alternating current.Then, change of current portion 3 is output in a highlights 4 using the alternating current that has carried out conversion as the lamp current that is supplied in discharge lamp 20.And change of current portion 3 controls above-mentioned switch element by the control signal of exporting from control part 7, and direct current is transformed to alternating current.
Point highlights 4 for example possesses the transformer of lighting and drive circuit thereof, by control part 7 be controlled at the startup of discharge lamp 20 time produce high voltage pulse and put on discharge lamp 20.And some highlights 4, after the startup of discharge lamp 20, is supplied in discharge lamp 20 by the alternating current of inputting from change of current portion 3 and makes the continuation of lighting of discharge lamp 20.
The modulating voltage of control part 7 based on detecting by voltage detection department 5 and the lamp current detecting by current detecting part 6, calculate being supplied in the lamp power of discharge lamp 20.And control part 7 makes DC power supply portion 2 control the direct current of exporting from DC power supply portion 2 in the following manner: the lamp power that makes to calculate becomes target power (the rated power Pm of discharge lamp 20 or become the lamp power below the rated power Pm of predetermined target for being supplied in discharge lamp 20).
And control part 7 is corresponding to the modulating voltage of the discharge lamp 20 detecting by voltage detection department 5, to be supplied in the modulation rate of the modulated lamp current of the amplitude of discharge lamp 20 from DC power supply portion 2, control.For example, control part 7, corresponding to the decline of the modulating voltage of discharge lamp 20, is controlled the modulation rate that is supplied in the lamp current of discharge lamp 20 for low modulation rate.
Particularly, control part 7 is for example, in the above situation of predetermined threshold value (, voltage V1) at the modulating voltage of the discharge lamp 20 detecting, and the modulation rate that is supplied in the lamp current of discharge lamp 20 is for example controlled, as predetermined modulation rate (, modulation rate 50%).And, control part 7 at the modulating voltage of the discharge lamp 20 detecting than predetermined threshold value (for example, voltage V1) in low situation, decline corresponding to the modulating voltage of discharge lamp 20, it is for example, than the low modulation rate of predetermined modulation rate (, modulation rate 50%) that the modulation rate that is supplied in the lamp current of discharge lamp 20 is controlled.And control part 7 is in the situation that control being supplied in the modulation rate of the lamp current of discharge lamp 20, by DC power supply portion 2 is controlled, to controlling from the direct current of DC power supply portion 2 outputs.
And, control part 7 in the situation that control being supplied in the modulation rate of the lamp current of discharge lamp 20, is controlled: making the modulating voltage of the discharge lamp 20 based on detecting and the average power of the lamp power that is supplied in discharge lamp 20 that lamp current calculates become certain power is target power in the following manner.Thus, control part 7 is being controlled and is carrying out in amplitude-modulated situation the modulation rate of lamp current, controls in the following manner: make average power can not surpass rated power Pm.
And the modulating frequency that is supplied in the drive current of discharge lamp 20 is the frequency that is synchronized with inputted picture synchronization signal frequency.For example, the modulating frequency that control part 7 makes to be supplied in the lamp current of discharge lamp 20 is synchronized with the frequency of inputted picture synchronization signal.Particularly, as utilize Fig. 1 to be illustrated, the image control portion 50 of projector 100 is output in discharge lamp driven apparatus 10 by picture synchronization signal.And, control part 7 is by the frequency of picture synchronization signal and the amplitude-modulated frequency synchronised of lamp current that make to input from image control portion 50, and in Yu projector 100, the left eye of institute's projection is controlled the Modulation and Amplitude Modulation of lamp current with the switching Timing Synchronization ground of the conversion timing of image or the shutter of shutter glasses 80 with image and right eye.
Fig. 6 means the oscillogram of lamp current having been carried out the output state of the each several part in Modulation and Amplitude Modulation situation in discharge lamp driven apparatus 10.
(1) of Fig. 6 represents respectively lamp current carry out Modulation and Amplitude Modulation and be supplied in output current (waveform shown in Fig. 6 (b)), the change of current waveform (waveform shown in Fig. 6 (c)) of modulating voltage (waveform shown in Fig. 6 (a)) in the situation of discharge lamp 20, DC power supply portion 2, output current (waveform shown in Fig. 6 (d)) and the lamp power (waveform shown in Fig. 6 (e)) of change of current portion 3.And, Fig. 6 (2) as and the comparison of Fig. 6 (1), represent lamp current not to be carried out to Modulation and Amplitude Modulation and be supplied in the waveform separately in the situation of discharge lamp 20.
In Fig. 6 (a), indication lamp voltage is the situation of voltage V1.The current waveform of Fig. 6 (b) for exporting by 7 control DC power supply portions 2 of control part.Lamp current is not being carried out in amplitude-modulated situation the electric current of DC power supply portion 2 outputs " rated power Pm/ voltage V1 ".On the other hand, lamp current is being carried out in amplitude-modulated situation, DC power supply portion 2 carries out Modulation and Amplitude Modulation and output current for the electric current of " rated power Pm/ voltage V1 ".Also have, the value of above-mentioned output current is that the target power that makes to be supplied in discharge lamp 20 is the value in the situation of rated power Pm.In addition, control part 7 is shown and by being synchronized with the frequency f s of inputted picture synchronization signal frequency, carries out the amplitude-modulated situation of the output current of DC power supply portion 2.
Fig. 6 (c) represents the control signal (change of current waveform) that 7 pairs of change of current portions 3 of control part control.In the figure, represent that change of current frequency is the situation of frequency f i of the frequency of 2 times of frequency f s.Change of current portion 3, by this change of current frequency, is that alternating current is exported by the current transformation of the current waveform shown in Fig. 6 (a).That is, the output current of change of current portion 3 is deformed into the waveform shown in Fig. 6 (d).Lamp current is not being carried out in amplitude-modulated situation the alternating current that change of current portion 3 output amplitudes are equal.On the other hand, lamp current is being carried out in amplitude-modulated situation, change of current portion 3 is at every 1 cycle of change of current frequency (frequency f i), the alternating current that output amplitude is different.
Fig. 6 (e) represents to be supplied in the lamp power of discharge lamp 20.Lamp current is not being carried out in amplitude-modulated situation, the lamp power that is supplied in discharge lamp 20 is rated power Pm.On the other hand, lamp current is being carried out in amplitude-modulated situation, be supplied in the lamp power of discharge lamp 20 for passing through the modulated power of frequency f s amplitude for rated power Pm.
Fig. 7 means the flow chart of control of the Modulation and Amplitude Modulation rate of lamp current.Below, utilize Fig. 7, about the control work of the Modulation and Amplitude Modulation rate of lamp current in discharge lamp driven apparatus 10, describe.
It is the state of lighting that discharge lamp 20 starts by discharge lamp driven apparatus 10.First, the modulating voltage of 5 pairs of discharge lamps 20 of voltage detection department of discharge lamp driven apparatus 10 detects, and the result detecting is output in to control part 7 (step S11).And current detecting part 6 is usingd the electric current of power line of negative electricity source of the output of flowing through DC power supply portion 2 and is detected as lamp current, and the result detecting is output in to control part 7 (step S12).
Next, the modulating voltage of control part 7 based on detecting by voltage detection department 5 and the lamp current detecting by current detecting part 6, calculate the lamp power of discharge lamp 20.Then, lamp power and predetermined target power that 7 pairs of control parts calculate compare, and to becoming the lamp current of target, calculate in the following manner: make the lamp power calculating become target power (step S13).
Whether the lamp current that becomes target that next, 7 pairs of control parts calculate is that rated current Im judges (step S14) below.In step S14, in the situation that be judged to be the lamp current that becomes target calculating, be not below rated current Im, control part 7 makes the modulation rate of lamp current be 0%, become and do not carry out amplitude-modulated setting, and the lamp current of being controlled by DC power supply portion 2 is set as to rated current Im (step S15), processing is proceeded to step S20.
On the other hand, in step S14, in the situation that be judged to be the lamp current that becomes target calculating, be below rated current Im, the lamp current that becomes target (step S16) that control part 7 is set as the lamp current of being controlled by DC power supply portion 2 to calculate in step S13.
Next, whether 7 pairs of modulating voltages that detect by voltage detection department 5 of control part are that predetermined threshold value (for example, voltage V1) is judged (step S17) above.In step S17, being judged to be modulating voltage, be that for example, in the above situation of predetermined threshold value (, voltage V1) control part 7 (is for example set as predetermined modulation rate by the Modulation and Amplitude Modulation rate of lamp current, modulation rate 50%) (step S18), proceeds to step S20 by processing.
On the other hand, in step S17, be judged to be modulating voltage not for predetermined threshold value (for example, voltage V1) in above situation, control part 7 is corresponding to the decline of modulating voltage, the Modulation and Amplitude Modulation rate of lamp current is for example set as, than the low modulation rate of predetermined modulation rate (, modulation rate 50%).For example, control part 7 for example, corresponding to (being reduced to predetermined threshold value, voltage V1) following modulating voltage, the Modulation and Amplitude Modulation rate of lamp current than predetermined modulation rate (is for example set as, modulation rate 50%) low modulation rate (for example, as the predefined modulation rate of the reduction corresponding to modulating voltage, modulation rate is arbitrary modulation rate more than 0% and among being less than 50%) (step S19).Then, control part 7 proceeds to step S20 by processing.
Then, the lamp current that become target of control part 7 based on setting in each step of step S15, S16, S18 or S19 and the Modulation and Amplitude Modulation rate of lamp current, control DC power supply portion 2: make to become the lamp current that sets and the Modulation and Amplitude Modulation rate (step S20) of lamp current in the following manner.Thus, DC power supply portion 2, by the control of control part 7, controls the output current of DC power supply portion 2 in the following manner: make to become the lamp current that sets and the Modulation and Amplitude Modulation rate of lamp current.
So, discharge lamp driven apparatus 10 has carried out constant power while driving when making lamp power become target power to discharge lamp, in the situation that lamp current surpasses rated current Im due to the decline of modulating voltage, carry out lamp current to be restricted to the control of rated current Im, make lamp current can not surpass rated current Im.And, discharge lamp driven apparatus 10 is in the situation that modulating voltage is more than predetermined threshold value, lamp current is controlled as to make lamp power become the such lamp current that becomes target of target power, and carry out this lamp current for example, to carry out amplitude-modulated control by predetermined modulation rate (, modulation rate 50%).On the other hand, discharge lamp driven apparatus 10 is in modulating voltage unscheduled threshold value above in the situation that, control as to make lamp power become the such lamp current that becomes target of target power, and carry out this lamp current by for example, carrying out amplitude-modulated control than the low modulation rate of predetermined modulation rate (, modulation rate 50%).
As with Shangdi, according to present embodiment, 10 pairs of lamp currents of discharge lamp driven apparatus carry out Modulation and Amplitude Modulation, and in the situation that modulating voltage reduces, and corresponding to the reduction of modulating voltage, make the modulation rate step-down of lamp current and carry out Modulation and Amplitude Modulation.Thus, the amplitude that discharge lamp driven apparatus 10 can make to be supplied in the lamp current of discharge lamp 20 become maximum during in the light quantity of discharge lamp 20 increase, and in the situation that modulating voltage reduces, by being controlled, suppresses modulation rate step-down the increase of the peak swing of lamp current.And discharge lamp driven apparatus 10 is because suppress heating by suppressing the increase of the peak swing of lamp current, so needn't use the parts of reply heating.Thus, discharge lamp driven apparatus 10 can increase or part dimension becomes and to suppress greatly component costs.Thereby, the in the situation that discharge lamp driven apparatus 10 driving discharge lamp 20 lamp current is carried out to Modulation and Amplitude Modulation, can to discharge lamp 20, drive by suitable lamp current.
And, in the situation that the situation that the modulating voltage of discharge lamp 20 reduces and being driven with identical lamp power before reducing with modulating voltage, compare with the light quantity of discharge lamp 20 before modulating voltage reduces, although the characteristic that the constant optical system that has a projector 100 of the light quantity of exporting from discharge lamp 20, light utilization ratio (the convergence efficiency of light) increases.This is because in the situation that the modulating voltage of discharge lamp 20 reduces, because arc light length in discharge lamp 20 is compared to that modulating voltage wants short before reducing, discharge lamp 20 becomes less point-source of light.Therefore,, even if discharge lamp driven apparatus 10 makes modulation rate step-down control the increase of the peak swing that suppresses lamp current by the reduction corresponding to modulating voltage, can not make the light quantity that arrives eyes reduce and can maintain light quantity yet.
Thereby, discharge lamp driven apparatus 10 is by modulating being supplied in the lamp current of discharge lamp 20, can make the amplitude of lamp current become maximum during in the light quantity of discharge lamp 20 increase, and in the situation that modulating voltage reduces, maintain this light quantity and by modulation rate step-down is controlled, suppress unchangeably the increase of the peak swing of lamp current.
Also have, although in the above-described embodiment, during the state that the shutter having about shutter glasses 80 is opened with the state of closing during identical situation be illustrated, also can be for during different length during separately.And, in the situation that this separately during not identical, discharge lamp driven apparatus 10 also can be to lamp current in during separately amplitude, by the not identical modulation rate of Modulation and Amplitude Modulation rate during Modulation and Amplitude Modulation rate during electric current increases and electric current minimizing is controlled in the following manner: make with the situation of modulating under average power become identical.
And, although in the above-described embodiment, about discharge lamp driven apparatus 10, control the example that the lamp power after the Modulation and Amplitude Modulation of lamp power before the Modulation and Amplitude Modulation that makes lamp current and lamp current becomes identical and be illustrated, be not limited to this.For example, discharge lamp driven apparatus 10 also can, with respect to the lamp power before the Modulation and Amplitude Modulation of lamp current, be controlled in the following manner: the lamp power after the Modulation and Amplitude Modulation of lamp current is diminished.And discharge lamp driven apparatus 10, in the scope of the power that can allow of the condition of the drive circuit having based on discharge lamp 20 and discharge lamp driven apparatus 10, also can make the lamp power after the Modulation and Amplitude Modulation of lamp current become large control.
And, although in the above-described embodiment, predetermined modulation rate while making lamp current carry out Modulation and Amplitude Modulation about discharge lamp driven apparatus 10 is 50% and is illustrated corresponding to the example that the reduction of modulating voltage is 0% by modulation rate from 50% control, but these modulation rates are an example, also can become by other modulation rates lamp current is carried out to amplitude-modulated control.
And, in the above-described embodiment, about discharge lamp driven apparatus 10, in the situation that carry out determining power drive and modulating voltage is reduced to the voltage V2 that lamp current becomes rated current Im with respect to the change of modulating voltage, the example that makes the unlikely rated current Im of surpassing of lamp current and control is illustrated.In this situation, the limits value of lamp current is not limited to rated current Im, and the condition of the drive circuit having according to discharge lamp 20 and discharge lamp driven apparatus 10, can be both allowed lowest high-current value, can be also predetermined current value arbitrarily.
In addition, in the above-described embodiment, the situation of the frequency f i of 2 times of the amplitude-modulated frequency f s that change of current frequency is lamp current in the change of current portion 3 controlling by control part 7 of take is illustrated as example, but change of current frequency can be also the frequency beyond the frequency f i of 2 times of this frequency f s.
And, in the above-described embodiment, about voltage detection department 5 and current detecting part 6, be connected in the output of DC power supply portion 2, using the output voltage of DC power supply portion 2 and flow through the example that the electric current of power line of negative electricity source of the output of DC power supply portion 2 detects as modulating voltage and lamp current respectively and be illustrated.But the position that connects voltage detection department 5 and current detecting part 6 is not limited to this.For example, also can connect in parallel voltage detection department 5 with respect to the lead-out terminal of a highlights 4, with respect to the power line that is connected in discharge lamp 20, be connected in series current detecting part 6, voltage detection department 5 and current detecting part 6 detect modulating voltage and lamp current respectively.
And, although in the above-described embodiment, as the projector 100 that possesses discharge lamp driven apparatus 10, about the 3D projector of time-sharing format, be illustrated, be not limited to this.For example, the projector 100 that possesses discharge lamp driven apparatus 10 also can be for to adopting and comprise that the colour disk of a plurality of colour filters carries out timesharing from the emitted white light of light source, and be the picture signal of color is carried out projection separately projector by the light modulation of this timesharing.And projector 100 can be also projection TV set or display unit such as projector for film.
Also have, control part 7 in present embodiment both can be realized by specialized hardware, and, also can pass through memory and CPU (Central Processing Unit, central processing unit) form, by being loaded into memory and carrying out this function is realized for realizing the program of the functions of above-mentioned control part 7.
And, also can will be recorded in the recording medium that computer can read for realizing the program of the functions of above-mentioned control part 7, the program that is recorded in this recording medium is read in computer system, by carrying out, carry out the each several part of control part 7 and process.In addition, the what is called " computer system " at this comprises the hardware such as OS and/or peripheral equipment.
And " computer system ", if in the situation that utilizing WWW system, also comprises that homepage provides environment (or display environment).
And so-called " recording medium that computer can read " refers to the removable mediums such as floppy disk, photomagneto disk, ROM, CD-ROM, is built in the storage devices such as hard disk of computer system.And so-called " recording medium that computer can read " also comprise as during short time that sends order wire in the situation of program by communication lines such as the networks such as the Internet and/or telephone lines, the medium that dynamically program kept, as in this situation, become server and/or client inside computer system volatile memory certain hour keep the medium of program.And said procedure both can be for having realized a part for above-mentioned functions, also can so that can with aforesaid function is recorded in computer system program combination and realize.
Above, although with reference to accompanying drawing in detail embodiments of the present invention are described in detail, concrete formation is not limited to this execution mode, also comprises the design of the scope that does not depart from this inventive concept etc.

Claims (9)

1. a discharge lamp driven apparatus, is characterized in that, possesses:
Power supply unit, it is according to inputted power, to controlling and export for being supplied in the electric current of the power of discharge lamp;
Voltage detection department, its driving voltage to aforementioned discharge lamp detects; With
Control part, it is corresponding to the driving voltage of the aforementioned discharge lamp detecting, and to be supplied in the modulation rate of the modulated drive current of the amplitude of aforementioned discharge lamp from aforementioned power supply unit, controls;
Aforementioned control part, corresponding to the decline of the driving voltage of aforementioned discharge lamp, is controlled the modulation rate that is supplied in the drive current of aforementioned discharge lamp for low modulation rate.
2. discharge lamp driven apparatus according to claim 1, is characterized in that:
Aforementioned control part, in the situation that the driving voltage of aforementioned discharge lamp is more than predetermined threshold value, is controlled the modulation rate that is supplied in the drive current of aforementioned discharge lamp for predetermined modulation rate;
And in the situation that the driving voltage of aforementioned discharge lamp is lower than aforementioned predetermined threshold value, corresponding to the decline of the driving voltage of aforementioned discharge lamp, the modulation rate that is supplied in the drive current of aforementioned discharge lamp is controlled as than the low modulation rate of aforementioned predetermined modulation rate.
3. discharge lamp driven apparatus according to claim 1, is characterized in that,
Possesses the current detecting part that the drive current of aforementioned discharge lamp is detected;
Aforementioned control part in the situation that control being supplied in the modulation rate of the drive current of aforementioned discharge lamp, is controlled: the average power of the driving voltage of the aforementioned discharge lamp based on detecting and the driving power of the aforementioned discharge lamp that drive current calculates is become necessarily in the following manner.
4. discharge lamp driven apparatus according to claim 2, is characterized in that,
Possesses the current detecting part that the drive current of aforementioned discharge lamp is detected;
Aforementioned control part in the situation that control being supplied in the modulation rate of the drive current of aforementioned discharge lamp, is controlled: the average power of the driving voltage of the aforementioned discharge lamp based on detecting and the driving power of the aforementioned discharge lamp that drive current calculates is become necessarily in the following manner.
5. according to the discharge lamp driven apparatus described in any one in claim 1～4, it is characterized in that:
The modulating frequency that is supplied in the drive current of aforementioned discharge lamp is the frequency that is synchronized with inputted picture synchronization signal frequency.
6. discharge lamp driven apparatus according to claim 2, is characterized in that:
Aforementioned predetermined threshold value is the voltage below the first interim driving voltage of the aforementioned discharge lamp of manufacture.
7.Yi Zhong projector, is characterized in that:
Possesses discharge lamp driven apparatus claimed in claim 1.
8.Yi Zhong projector, is characterized in that, possesses:
Discharge lamp driven apparatus claimed in claim 1, and
Image control portion, it passes through time-sharing format, carry out that the image of institute's projection is alternately converted to left eye and with image and right eye, use the control of image, and output is synchronized with aforementioned left eye image and the aforementioned right eye picture synchronization signal of the conversion timing of image;
Aforementioned discharge lamp driven apparatus, based on aforementioned picture synchronization signal, carries out Modulation and Amplitude Modulation to be synchronized with earlier figures as the frequency of synchronous signal frequency to being supplied in the drive current of aforementioned discharge lamp.
9. a discharge lamp driving method, is characterized in that, comprises the following steps:
Power supply unit is according to inputted power, to controlling and export for being supplied in the electric current of the power of discharge lamp;
Voltage detection department detects the driving voltage of aforementioned discharge lamp; With
Control part is corresponding to the driving voltage of the aforementioned discharge lamp detecting, and to be supplied in the modulation rate of the modulated drive current of the amplitude of aforementioned discharge lamp from aforementioned power supply unit, controls;
Aforementioned control part, corresponding to the decline of the driving voltage of aforementioned discharge lamp, is controlled the modulation rate that is supplied in the drive current of aforementioned discharge lamp for low modulation rate.
CN201210007471.6A 2011-01-11 2012-01-11 Discharge lamp driving device, projector, and method for driving a discharge lamp Expired - Fee Related CN102595750B (en)

Applications Claiming Priority (2)

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JP002939/2011 2011-01-11
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